var1 = input('输入变量1: \n')
var2 = input('输入变量2: \n')
var3 = input('输入运算符号: \n')
# print(var2)
# print(var1 * 3)
# print(var1 in var2)
# print(var1[0])
# print(var1[-1])
# print(var1[0:3])
# print(eval("1+2"))
print(eval(f"{var1} {var3} {var2}"))
